'I
Station 3
Station 19
Cl
E 100
100
.
Cl
::t
TAG
-; 80
80
I
en
I
I'll
f. I i m
I
:E 60
. ! ~
:=::60
PL
clJ
i
~
~1'
0
;::
::::~
.. ,c:
:.:i::"::
o : ; : ;
(J)
40
ih ~l~j
j~~j;
~
40
~
....
u..
-0
.~
20
111 II ••
i;lll!
JI [
20
~
~i t~ :~ ~u
1. ~~
;i
0
Jul
&
_ . . . . .
21
25
Time (dates)
FIGURE 6.6. Seasonal variation (mean
± SE) in major lipid classes in Dreissena polymorpha
from the two
sampling sites in Lake St. Clair in 1990. Station 3 had high mussel densities, and station
19 had low mussel
densities. Values are given
as f1g lipid' mg lipid-free dry mass - I.
TAG,
triacylglycerol; PL, phospholipid; Other,
acetone mobile polar lipid, free fatty acid, sterol. (From Nalepa et
aI., 1993.)
N
N
<....;
~
n
~
-<
e:..
~
0
~
::>
0~
~
Cl
~
..
0::>
(1)
..